<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.14/dist/vue.js"></script>
</head>

<body>
    <div id="app">
        <h2>性别</h2>
        <input type="radio" value="male" v-model="sex">男
        <input type="radio" value="female" v-model="sex">女
    </div>
    <script>
        new Vue({
            data() {
                return {
                    sex: ""
                }
            },
        }).$mount("#app")
    </script>
</body>

</html>